root/trunk/pdns/pdns/rec_channel_rec.cc @ 1243

#include "utility.hh"
#include "rec_channel.hh"
#include <boost/lexical_cast.hpp>
#include <boost/bind.hpp>
#include <vector>
#include "misc.hh"
#include "recursor_cache.hh"
#include "syncres.hh"
#include <boost/function.hpp>
#include <boost/optional.hpp>
#include <boost/tuple/tuple.hpp>
#include <boost/format.hpp>
#include <boost/algorithm/string.hpp>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "logger.hh"
#include "dnsparser.hh"
#include "arguments.hh"
#ifndef WIN32
#include <sys/resource.h>
#include <sys/time.h>
#endif

using namespace std;
using namespace boost;
map<string, const uint32_t*> d_get32bitpointers;
map<string, const uint64_t*> d_get64bitpointers;
map<string, function< uint32_t() > >  d_get32bitmembers;

void addGetStat(const string& name, const uint32_t* place)
{
  d_get32bitpointers[name]=place;
}
void addGetStat(const string& name, const uint64_t* place)
{
  d_get64bitpointers[name]=place;
}
void addGetStat(const string& name, function<uint32_t ()> f ) 
{
  d_get32bitmembers[name]=f;
}

optional<uint64_t> get(const string& name) 
{
  optional<uint64_t> ret;

  if(d_get32bitpointers.count(name))
    return *d_get32bitpointers.find(name)->second;
  if(d_get64bitpointers.count(name))
    return *d_get64bitpointers.find(name)->second;
  if(d_get32bitmembers.count(name))
    return d_get32bitmembers.find(name)->second();

  return ret;
}


template<typename T>
string doGet(T begin, T end)
{
  string ret;

  for(T i=begin; i != end; ++i) {
    optional<uint64_t> num=get(*i);
    if(num)
      ret+=lexical_cast<string>(*num)+"\n";
    else
      ret+="UNKNOWN\n";
  }
  return ret;
}

template<typename T>
string doGetParameter(T begin, T end)
{
  string ret;
  string parm;
  for(T i=begin; i != end; ++i) {
    if(::arg().parmIsset(*i)) {
      parm=::arg()[*i];
      replace_all(parm, "\\", "\\\\");
      replace_all(parm, "\"", "\\\"");
      replace_all(parm, "\n", "\\n");
      ret += *i +"=\""+ parm +"\"\n";
    }
    else
      ret += *i +" not known\n";
  }
  return ret;
}


template<typename T>
string doDumpCache(T begin, T end)
{
  T i=begin;
  string fname;

  if(i!=end) 
    fname=*i;

  int fd=open(fname.c_str(), O_CREAT | O_EXCL | O_WRONLY, 0660);
  if(fd < 0) 
    return "Error opening dump file for writing: "+string(strerror(errno))+"\n";

  RC.doDumpAndClose(fd); 

  return "done\n";
}

template<typename T>
string doWipeCache(T begin, T end)
{
  int count=0, countNeg=0;
  for(T i=begin; i != end; ++i) {
    count+=RC.doWipeCache(toCanonic("", *i));
    string canon=toCanonic("", *i);
    countNeg+=SyncRes::s_negcache.count(tie(canon));
    pair<SyncRes::negcache_t::iterator, SyncRes::negcache_t::iterator> range=SyncRes::s_negcache.equal_range(tie(canon));
    SyncRes::s_negcache.erase(range.first, range.second);
  }

  return "wiped "+lexical_cast<string>(count)+" records, "+lexical_cast<string>(countNeg)+" negative records\n";
}

template<typename T>
string doSlashCache(T begin, T end)
{
  RC.doSlash(10);

  return "done\n";
}

#if 0  // broken!
uint32_t getQueryRate()
{
  struct timeval now;
  gettimeofday(&now, 0);
  optional<float> delay=g_stats.queryrate.get(now, 10);
  if(delay)
    return (uint32_t)(1000000/(*delay));
  else
    return 0;
}
#endif 

#ifndef WIN32
static uint64_t getSysTimeMsec()
{
  struct rusage ru;
  getrusage(RUSAGE_SELF, &ru);
  return (ru.ru_stime.tv_sec*1000ULL + ru.ru_stime.tv_usec/1000);
}

static uint64_t getUserTimeMsec()
{
  struct rusage ru;
  getrusage(RUSAGE_SELF, &ru);
  return (ru.ru_utime.tv_sec*1000ULL + ru.ru_utime.tv_usec/1000);
}
#endif

static uint64_t calculateUptime()
{
  return time(0) - g_stats.startupTime;
}

static string doCurrentQueries()
{
  ostringstream ostr;

  ostr << MT->d_waiters.size() <<" currently outstanding questions\n";

  boost::format fmt("%1% %|40t|%2% %|47t|%3% %|63t|%4% %|68t|%5%\n");

  ostr << (fmt % "qname" % "qtype" % "remote" % "tcp" % "chained");
  int n=0;
  for(MT_t::waiters_t::iterator mthread=MT->d_waiters.begin(); mthread!=MT->d_waiters.end() && n < 100; ++mthread, ++n) {
    const PacketID& pident = mthread->key;
    ostr << (fmt 
             % pident.domain % DNSRecordContent::NumberToType(pident.type) 
             % pident.remote.toString() % (pident.sock ? 'Y' : 'n')
             % (pident.fd == -1 ? 'Y' : 'n')
             );
  }
  ostr <<" - done\n";
  return ostr.str();
}

RecursorControlParser::RecursorControlParser()
{
  addGetStat("questions", &g_stats.qcounter);
  addGetStat("tcp-questions", &g_stats.tcpqcounter);

  addGetStat("cache-hits", &RC.cacheHits);
  addGetStat("cache-misses", &RC.cacheMisses);

  addGetStat("cache-entries", boost::bind(&MemRecursorCache::size, ref(RC)));
  addGetStat("servfail-answers", &g_stats.servFails);
  addGetStat("nxdomain-answers", &g_stats.nxDomains);
  addGetStat("noerror-answers", &g_stats.noErrors);

  addGetStat("unauthorized-udp", &g_stats.unauthorizedUDP);
  addGetStat("unauthorized-tcp", &g_stats.unauthorizedTCP);
  addGetStat("tcp-client-overflow", &g_stats.tcpClientOverflow);

  addGetStat("client-parse-errors", &g_stats.clientParseError);
  addGetStat("server-parse-errors", &g_stats.serverParseError);

  addGetStat("answers0-1", &g_stats.answers0_1);
  addGetStat("answers1-10", &g_stats.answers1_10);
  addGetStat("answers10-100", &g_stats.answers10_100);
  addGetStat("answers100-1000", &g_stats.answers100_1000);
  addGetStat("answers-slow", &g_stats.answersSlow);

  addGetStat("qa-latency", &g_stats.avgLatencyUsec);
  addGetStat("unexpected-packets", &g_stats.unexpectedCount);
  addGetStat("case-mismatches", &g_stats.caseMismatchCount);
  addGetStat("spoof-prevents", &g_stats.spoofCount);

  addGetStat("nsset-invalidations", &g_stats.nsSetInvalidations);

  addGetStat("resource-limits", &g_stats.resourceLimits);
  addGetStat("dlg-only-drops", &SyncRes::s_nodelegated);
  
  addGetStat("shunted-queries", &g_stats.shunted);
  addGetStat("noshunt-size", &g_stats.noShuntSize);
  addGetStat("noshunt-expired", &g_stats.noShuntExpired);
  addGetStat("noshunt-nomatch", &g_stats.noShuntNoMatch);
  addGetStat("noshunt-cname", &g_stats.noShuntCNAME);
  addGetStat("noshunt-wrong-question", &g_stats.noShuntWrongQuestion);
  addGetStat("noshunt-wrong-type", &g_stats.noShuntWrongType);

  addGetStat("negcache-entries", boost::bind(&SyncRes::negcache_t::size, ref(SyncRes::s_negcache)));
  addGetStat("throttle-entries", boost::bind(&SyncRes::throttle_t::size, ref(SyncRes::s_throttle)));
  addGetStat("nsspeeds-entries", boost::bind(&SyncRes::nsspeeds_t::size, ref(SyncRes::s_nsSpeeds)));

  addGetStat("concurrent-queries", boost::bind(&MTasker<PacketID,string>::numProcesses, ref(MT)));
  addGetStat("outgoing-timeouts", &SyncRes::s_outgoingtimeouts);
  addGetStat("tcp-outqueries", &SyncRes::s_tcpoutqueries);
  addGetStat("all-outqueries", &SyncRes::s_outqueries);
  addGetStat("ipv6-outqueries", &g_stats.ipv6queries);
  addGetStat("throttled-outqueries", &SyncRes::s_throttledqueries);
  addGetStat("throttled-out", &SyncRes::s_throttledqueries);
  addGetStat("unreachables", &SyncRes::s_unreachables);
  addGetStat("chain-resends", &g_stats.chainResends);

  addGetStat("uptime", calculateUptime);

#ifndef WIN32
  //  addGetStat("query-rate", getQueryRate);
  addGetStat("user-msec", getUserTimeMsec);
  addGetStat("sys-msec", getSysTimeMsec);
#endif
}

static void doExit()
{
  L<<Logger::Error<<"Exiting on user request"<<endl;
  extern RecursorControlChannel s_rcc;
  s_rcc.~RecursorControlChannel(); 

  extern string s_pidfname;
  if(!s_pidfname.empty()) 
    unlink(s_pidfname.c_str()); // we can at least try..
  _exit(1);
}

string doTopRemotes()
{
  typedef map<ComboAddress, int, ComboAddress::addressOnlyLessThan> counts_t;
  counts_t counts;
  
  unsigned int total=0;
  for(RecursorStats::remotes_t::const_iterator i=g_stats.remotes.begin(); i != g_stats.remotes.end(); ++i)
    if(i->sin4.sin_family) {
      total++;
      counts[*i]++;
    }

  typedef multimap<int, ComboAddress> rcounts_t;
  rcounts_t rcounts;
  
  for(counts_t::const_iterator i=counts.begin(); i != counts.end(); ++i)
    rcounts.insert(make_pair(-i->second, i->first));

  ostringstream ret;
  ret<<"Over last "<<total<<" queries:\n";
  format fmt("%.02f%%\t%s\n");
  int limit=0;
  if(total)
    for(rcounts_t::const_iterator i=rcounts.begin(); i != rcounts.end() && limit < 20; ++i, ++limit)
      ret<< fmt % (-100.0*i->first/total) % i->second.toString();

  return ret.str();
}

string RecursorControlParser::getAnswer(const string& question, RecursorControlParser::func_t** command)
{
  *command=nop;
  vector<string> words;
  stringtok(words, question);

  if(words.empty())
    return "invalid command\n";

  string cmd=toLower(words[0]);
  vector<string>::const_iterator begin=words.begin()+1, end=words.end();

  if(cmd=="get") 
    return doGet(begin, end);

  if(cmd=="get-parameter") 
    return doGetParameter(begin, end);


  if(cmd=="quit") {
    *command=&doExit;
    return "bye\n";
  }

  if(cmd=="dump-cache") 
    return doDumpCache(begin, end);

  if(cmd=="slash-cache") 
    return doSlashCache(begin, end);

  if(cmd=="wipe-cache") 
    return doWipeCache(begin, end);

  if(cmd=="reload-lua-script") 
    return doReloadLuaScript(begin, end);

  if(cmd=="unload-lua-script") {
    vector<string> empty;
    empty.push_back(string());
    return doReloadLuaScript(empty.begin(), empty.end());
  }


  if(cmd=="top-remotes")
    return doTopRemotes();

  if(cmd=="current-queries")
    return doCurrentQueries();
  
  if(cmd=="ping")
    return "pong\n";

  if(cmd=="reload-zones") {
    return reloadAuthAndForwards();
  }

  return "Unknown command '"+cmd+"'\n";
}